[WIP] Swap in codemirror for prism

[zchrykng]

⚠️⚠️⚠️ Since we do not accept all types of pull requests and do not want to waste your time. Please be sure that you have read pull request rules:
https://github.com/louislam/dockge/blob/master/CONTRIBUTING.md

Tick the checkbox if you understand [x]:

• I have read and understand the pull request rules.

Description

Fixes #105 by swapping out the prism editor for vue-codemirror. I know this is a work in progress, but I'm submitting the pull request so that more eyes can be on it as I make progress.

This is my first time working with Vue, so I apologize in advance for any beginner mistakes.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• User interface (UI)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

Please do not use any external image service. Instead, just paste in or drag and drop the image here, and it will be uploaded automatically.

[zchrykng]

Was there any feedback on this? I'm happy to keep working on the PR/polishing the styling, but I wanted to make sure that @louislam was okay with the direction.